首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1746篇
  免费   19篇
  国内免费   11篇
教育   1069篇
科学研究   121篇
各国文化   10篇
体育   419篇
综合类   1篇
文化理论   28篇
信息传播   128篇
  2023年   12篇
  2022年   31篇
  2021年   42篇
  2020年   42篇
  2019年   68篇
  2018年   102篇
  2017年   90篇
  2016年   95篇
  2015年   44篇
  2014年   63篇
  2013年   208篇
  2012年   85篇
  2011年   75篇
  2010年   80篇
  2009年   61篇
  2008年   62篇
  2007年   63篇
  2006年   71篇
  2005年   54篇
  2004年   42篇
  2003年   32篇
  2002年   38篇
  2001年   33篇
  2000年   21篇
  1999年   23篇
  1998年   23篇
  1997年   17篇
  1996年   10篇
  1995年   8篇
  1994年   8篇
  1993年   8篇
  1992年   11篇
  1991年   8篇
  1990年   14篇
  1989年   7篇
  1988年   8篇
  1987年   5篇
  1986年   8篇
  1985年   5篇
  1984年   11篇
  1983年   5篇
  1982年   4篇
  1981年   5篇
  1980年   5篇
  1979年   9篇
  1978年   5篇
  1977年   6篇
  1975年   11篇
  1974年   6篇
  1968年   3篇
排序方式: 共有1776条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
45.
46.
47.
During the last decades, the education system has been marked by distinct processes of internationalisation. In the field of higher education, there are numerous and varied schools with different international profiles. This paper focuses on processes of internationalisation in the German sector of higher education. We contrast two higher secondary schools with international profiles: one international school in a West German metropolitan region with a long tradition and a younger internationally-profiled school located in the periphery of an East German urban centre. This institutional analysis presents school cultural similarities and differences with regard to different claims and concepts of internationality. This analysis is complemented by a reconstruction of three patterns of biographical meaning examining the internationality of pupils and their respective habitual fit to these internationally-profiled schools. We draw on qualitative data, consisting mainly of interviews with head teachers and pupils of these two schools. We argue that these differing regional forms of internationalisation indicate a stratification and hierarchisation in the field of higher education in Germany.  相似文献   
48.
49.

Introduction

Extremely high glucose concentrations have been shown to interfere with creatinine assays especially with Jaffe method in peritoneal dialysate. Because diabetes is the fastest growing chronic disease in the world, laboratories study with varying glucose concentrations. We investigated whether different levels of glucose spiked in serum interfere with 21 routine chemistry and thyroid assays at glucose concentrations between 17-51 mmol/L.

Materials and methods

Baseline (group I) serum pool with glucose concentration of 5.55 (5.44-5.61) mmol/L was prepared from patient sera. Spiking with 20% dextrose solution, sample groups were obtained with glucose concentrations: 17.09, 34.52, and 50.95 mmol/L (group II, III, IV, respectively). Total of 21 biochemistry analytes and thyroid tests were studied on Abbott c8000 and i2000sr with commercial reagents. Bias from baseline value was checked statistically and clinically.

Results

Creatinine increased significantly by 8.74%, 31.66%, 55.31% at groups II, III, IV, respectively with P values of < 0.001. At the median glucose concentration of 50.95 mmol/L, calcium, albumin, chloride and FT4 biased significantly clinically (-0.85%, 1.63%, 0.65%, 7.4% with P values 0.138, 0.214, 0.004, < 0.001, respectively). Remaining assays were free of interference.

Conclusion

Among the numerous biochemical parameters studied, only a few parameters are affected by dramatically increased glucose concentration. The creatinine measurements obtained in human sera with the Jaffe alkaline method at high glucose concentrations should be interpreted with caution. Other tests that were affected with extremely high glucose concentrations were calcium, albumin, chloride and FT4, hence results should be taken into consideration in patients with poor diabetic control.Key words: assay interference, glucose interference, preanalytical phase, creatinine, Jaffe kinetic assay, thyroid function tests  相似文献   
50.
从图论的角度讨论了静态最优路径的算法及其复杂度,在此基础上对停车诱导功能需求进行研究,提出了停车场内部诱导系统的设计思路和方法.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号